u 4 ( − v 2 ) − 2 u 3 v 3 + 2 u 3 v 2 − u 3 v − u 2 v 4 + 2 u 2 v 3 − 3 u 2 v 2 + 2 u 2 v − u 2 − u v 3 + 2 u v 2 − 2 u v − v 2 u 2 v 2 {\displaystyle {\frac {u^{4}\left(-v^{2}\right)-2u^{3}v^{3}+2u^{3}v^{2}-u^{3}v-u^{2}v^{4}+2u^{2}v^{3}-3u^{2}v^{2}+2u^{2}v-u^{2}-uv^{3}+2uv^{2}-2uv-v^{2}}{u^{2}v^{2}}}}
